TWI644573B - Headphone type audio device - Google Patents

Abstract

An earphone type acoustic device comprising: a headband; and a pair of sliding blocks each having one end portion slidably attached to both end portions of the headband; and a pair of outer casing blocks respectively in a pair of sliding blocks The other end portions are connected through the connection portion, and each of the end portions is provided with an earphone element, and the speaker elements are respectively disposed on the pair of slide blocks.

Description

Headphone type audio device

This technology relates to an earphone type acoustic device in which an earphone used for listening to music is integrated with a speaker.

Most of the headphones are called a sealed type. The sealed type earphone is configured as an acoustic device that is formed in a sealed space between the earphone element and the ear to produce an optimum sound. On the other hand, the speaker is designed on the premise that the sound is heard at a certain distance. The earphone and the speaker are similar in construction, and the biggest difference can be said to make the power (sound pressure) of the air vibration different. That is, the earphones need only have a power to vibrate the air in the sealed space, but the speaker requires a large amount of power for vibrating the space with the user.

Patent Document 1 discloses an earphone that has both functions of a headphone function and a speaker function, and the output power of the headphone speaker is controlled by a switch, and the low power for the earphone and the high power for the speaker are used. Switch between.

However, the earphone of Patent Document 1 described above is an output power of a speaker element provided in the casing, and a low power and a sound for the earphone. The switch between the high power used by the device. Therefore, when a speaker element is used as a speaker, it must be used as a placement type speaker. At this time, it is difficult to sufficiently exert the stereo effect of stereo reproduction by the distance between the speaker elements provided in the left and right outer casings.

[Previous Technical Literature] [Patent Literature]

[Patent Document 1] Japanese Laid-Open Patent Publication No. 2010-74831 (paragraph [0019], etc.)

A headphone type audio device in which an earphone and a speaker are integrated, for example, is expected to be easy to use or to improve the sound quality of the speaker.

In view of the above circumstances, the object of the present technology is to improve the performance of an earphone type acoustic device in which an earphone and a speaker are integrated.

In order to solve the above problems, the earphone type acoustic device of the present invention includes: a headband; and a pair of sliders each having one end portion slidably attached to both end portions of the headband; and a pair of outer casing blocks The other end portions of the pair of slide blocks are coupled to each other via a connection portion, and each of the pair of slide blocks is provided with an earphone element; and the speaker elements are respectively disposed on the pair of slide blocks.

Regarding the earphone type acoustic device of the present technology, in addition to the earphone elements respectively provided in the pair of outer casing blocks, the pair of sliding blocks are respectively provided with speaker elements. When the speaker element is used to enjoy music, it is only necessary to hang the headband and the left and right slider portions on the neck of the user. In this wear state, the pair of speaker elements are respectively located below the left and right ears of the user, so that the sound from the respective speaker elements reaches the user's ear well through the space. Moreover, since the speaker element is provided on the slider, the positional relationship between the speaker element and the user's ear can be adjusted by sliding the slider.

The earphone type audio device may further include: a first amplifier that amplifies an audio signal supplied to the earphone element; and a second amplifier that increases an amplitude of an audio signal supplied to the speaker element; and an operation unit And receiving a switching instruction from the user; and a control unit that switches the first amplifier and the second amplifier in accordance with the instruction received by the operation unit.

Thereby, the user can freely switch between the earphone element and the speaker element to switch the element to be outputted.

The speaker element may include a speaker driving element including a vibrating plate that can vibrate in a thickness direction of the sliding block, a magnetic circuit that drives the vibrating plate, and a state in which the vibrating plate is exposed. a housing that holds and houses the vibrating plate and the magnetic circuit; the cover forms a space between the surface on which the vibrating plate is exposed and the housing, and has a function for allowing sound to be located in the space Released at one end of the direction in which the sliding direction of the sliding block forms an orthogonal direction Opening.

An opening is provided in the space to allow the sound to be emitted from one end of the direction in which the sliding direction of the slider is orthogonal, whereby the earphone type acoustic device can be used when it is used by hanging on the neck of the user. The sound is emitted towards the user's ear. Thereby, it is not necessary to greatly increase the volume of the speaker element, and the user can enjoy the music at a sufficient volume.

One end of the space in which the sliding direction of the slider blocks is orthogonal to the front side is the front side when the user wears the state of the earphone type acoustic device.

As described above, according to the present technology, it is possible to improve the performance of the earphone type acoustic device in which the earphone and the speaker are integrated.

10‧‧‧ headband

20R, 20L‧‧‧ sliding block

21‧‧‧Sliding base

22‧‧‧Sliding cover

24‧‧‧Speaker components

30R, 30L‧‧‧ bracket

31‧‧‧ First Link

32‧‧‧Second Link

33‧‧‧Axis

34‧‧‧Club Department

35‧‧‧Axis

40R, 40L‧‧‧ housing blocks

41‧‧‧Baffle

42‧‧‧Shell

43‧‧‧ ear pads

44, 44‧‧‧ headphone components

100‧‧‧ headphone type audio device

110‧‧‧ processor

112‧‧‧ memory

114‧‧‧User Operations Department

116‧‧‧Cache memory

118‧‧‧ headphone amplifier

119‧‧‧Speaker amplifier

241‧‧‧Speaker drive components

242‧‧‧Upper casing

243‧‧‧ Lower case

244‧‧‧Speaker cover

245‧‧‧Speaker grid

247‧‧‧Voice port

248‧‧‧ slit opening

Fig. 1 is a perspective view showing an earphone type acoustic device according to a first embodiment of the present technology.

Fig. 2 is a cross-sectional view showing the structure of the earphone type acoustic device of Fig. 1.

Fig. 3 is a longitudinal sectional view of a speaker element.

4 is a cross-sectional view of a speaker element.

Fig. 5 is an external view showing the configuration of the speaker element 24 after the outer casing is removed.

Fig. 6 is a view showing a head wearing type of the earphone type acoustic device of the present embodiment.

Fig. 7 is a view showing a state in which the earphone type acoustic device of the present embodiment is hung on the neck.

Fig. 8 is a view showing a circuit configuration of an earphone type acoustic device of the present embodiment.

Fig. 9 is a view showing a method of adjusting the position of the speaker.

Hereinafter, an embodiment of the present technology will be described with reference to the drawings.

<First embodiment> [Configuration of earphone type audio device]

Fig. 1 is a perspective view showing an earphone type acoustic device according to a first embodiment of the present technology.

As shown in the figure, the headphone type acoustic device 100 includes a headband 10, left and right sliders 20R and 20L, left and right brackets 30R and 30L (connecting portions), and left and right housing blocks 40R and 40L.

Further, the symbol "R" means the right side, and the "L" means the left side, and the left and right sides are determined by the user's face when the earphone type acoustic device 100 is worn.

The headband 10 is attached to a head or a neck of a human body, and is, for example, integrally bent at a predetermined curvature, and is made of a flexible sheet such as a synthetic resin. At both ends of the headband 10 The outer casing blocks 40R, 40L are not attached by the sliding blocks 20R, 20L and the brackets 30R, 30L.

Fig. 2 is a cross-sectional view showing the structure of the earphone type acoustic device 100 of Fig. 1.

Each of the sliders 20R and 20L has a slide base 21, a slide cover 22, a holder coupling portion 23, and a speaker element 24.

In order to slidably hold one end portion 11 of the headband 10, the slide base 21 is provided with an insertion portion 25 that is inserted into one end portion 11 of the headband 10, and a locking portion provided inside the insertion portion 25. In the structure (not shown) or the like, the locking structure is locked to a locking portion (not shown) such as a projection provided on the surface of the end portion 11 of the headband 10, whereby the insertion position of the headband 10 is fixed. The user can adjust the insertion amount of one of the end portions 11 of the headband 10 so that the respective outer casing blocks 40R, 40L fit the left and right ears of the user by appropriate manual adjustment.

The slide cover 22 is an exterior cover for the slide base 21.

The bracket connecting portion 23 is a portion that is coupled to the brackets 30R and 30L to be described later.

Each of the sliders 20R and 20L is fixed with a speaker element 24 that includes a component group necessary for the earphone type acoustic device 100 of the present embodiment to function as a speaker. The term "speaker" as used herein refers to an acoustic device that vibrates the air in the surrounding open space and transmits the sound to the user. In the present specification, it is used to vibrate the air enclosed by the outer casing block. The different meanings of the "headphones" that the sound conveys to the user.

The brackets 30R and 30L include a first connecting portion 31 for connecting to the bracket connecting portion 23 of the sliders 20R and 20L, and a second connecting portion 32 for connecting to the outer casing blocks 40R and 40L (see FIG. 1). The first joint portion 31 has a shaft portion 33. The shaft portion 33 is coupled to the bearing portion 27 provided in the bracket coupling portion 23 of the sliders 20R, 20L. The bearing portion 27 is an element for rotatably holding the shaft portion 33 of the first coupling portion 31 of the brackets 30R, 30L. As described above, the shaft portion 33 of the first coupling portion 31 of the brackets 30R, 30L is coupled to the bearing portion 27 of the bracket coupling portion 23 of the sliders 20R, 20L, whereby the brackets 30R, 30L are paired with the slider 20R, 20L is connected in a state of being freely rotated about the axial direction.

Further, the first coupling portion 31 having the shaft portion 33 is integrally formed with the brackets 30R and 30L, whereby sufficient durability can be imparted.

On the other hand, the second connecting portions 32 (see FIG. 1) of the brackets 30R and 30L rotatably support the outer casing blocks 40R and 40L. The second coupling portion 32 is configured such that the outer casing blocks 40R and 40L are rotatable in the axial direction in which the axial direction of the shaft portion 33 of the first coupling portion 31 is orthogonal to each other. The second connecting portion 32 has a branching portion 34 that is provided to extend from the vicinity of the first connecting portion 31, and a shaft portion 35 that is provided at each of the front end portions of the branching portion 34.

The shaft portion 35 is protruded from the surface of the branching portion 34 to the surface of the outer casing 42 of the outer casing blocks 40R, 40L. The respective shaft portions 35 of the left and right brackets 30R and 30L are arranged to be aligned on a straight line passing through one of the centers of the outer casing 42 and substantially function as an integral shaft. The respective shaft portions 35 of the left and right brackets 30R, 30L are inserted into the outer casing The bearing hole 42 (not shown) of 42 is held.

[Configuration of outer casing blocks 40R, 40L]

Next, the configuration of the outer casing blocks 40R, 40L will be described.

Each of the outer casing blocks 40R and 40L has a partition 41, a casing 42, an ear pad 43, an earphone element 44, a wiring board 45, and the like.

The partition plate 41 is a substantially disk-shaped base material that fixes the outer casing 42, the ear pad 43, and the earphone element 44.

The outer casing 42 is used to cover the slightly cylindrical casing of the earphone element 44.

The ear pad 43 is a substantially donut-shaped member for covering the user's ear.

Further, the shape of each of the partition 41, the outer casing 42, and the ear pad 43 is not limited to the above.

The earphone element 44 is composed of a vibrating plate and a magnetic circuit (for example, a magnet and a voice coil) for converting an electric signal into air vibration (sound).

The wiring board 45 is provided with a processor and a memory, and further includes a substrate on which an integrated circuit and other electronic components necessary for realizing the function of the audio reproduction device are mounted.

Further, for example, the casing 42 is provided with a slide switch 46 which is a part of the user operation portion 114 (see FIG. 8), and other switches such as a push button switch and a knob switch.

[Configuration of speaker components]

Next, the configuration of the speaker element 24 will be described.

In the earphone type acoustic device 100 of the present embodiment, as the device for outputting sound, in addition to the earphone element 44 in the outer casing blocks 40R, 40L, a speaker element 24 is provided.

The speaker elements 24 are disposed on the left and right sliders 20R and 20L, respectively. The speaker element 24 is provided on a predetermined side of the slide switches 20R and 20L, that is, on the side facing the outer side when the earphone type acoustic device 100 is hung on the user's head or neck.

3 is a longitudinal cross-sectional view showing the structure of the speaker element 24, FIG. 4 is a cross-sectional view showing the structure of the speaker element 24, and FIG. 5 is an exploded view showing a part of the structure including the sliders 20R and 20L of the speaker element 24. Stereo picture.

The speaker element 24 includes a vibrating plate for converting an electric signal into air vibration (sound), a magnetic circuit for driving the vibrating plate (for example, a magnet, a voice coil, and the like), and housings 242 and 243 for housing the same. The speaker driving element 241 and the speaker cover 244 and the speaker grid 245 constituting the cover of the speaker driving element 241.

The housings 242, 243 are composed of an upper housing 242 and a lower housing 243. The upper casing 242 is provided with a vibrating plate holding opening portion 246 for holding the vibrating plate (249 of FIG. 5) in an exposed state around the vibrating plate. The casings 242 and 243 are fixed to the cushioning members 28 of the sliding bases 21 of the sliding blocks 20R and 20L, and are fixed by connecting members such as screws.

The speaker cover 244 is mounted on the speaker driving element 241 Above, a space is formed between the vibrating plate of the speaker driving element 241 and the surface of the upper casing 242.

The speaker panel 245 further covers the decorative cover part outside the speaker cover 244.

As shown in FIGS. 3 and 4, a space S is formed between the diaphragm of the speaker driving element 241 and the surface of the upper casing 242 and the speaker cover 244. In order to radiate sound pressure from the inside to the outside with a predetermined directivity, a sound emitting port 247 for releasing sound from the space to the outside is provided on one side surface of the speaker cover 244. Further, a speaker panel 245 that covers the outside of the speaker cover 244 is provided with a slit opening portion 248 corresponding to the sound emitting port 247 of the speaker cover 244. In other words, the sound pressure outputted from the speaker driving element 241 is discharged from the above-described space S through the sound emitting opening 247 provided on one surface side of the speaker cover 244 and the slit opening portion 248 of the speaker grid 245. external. That is, the speaker cover 244 and the speaker panel 245 are collectively referred to as a cover body, and the cover body is provided with a region in which the openings of the sound emission opening 247 and the slit opening portion 248 overlap each other as a sound for making sound from the space S. Release the substantial opening to the outside.

Further, in order to smoothly induce the sound radiated from the diaphragm of the speaker driving element 241 to the sound emitting port 247 provided on one side of the speaker cover 244, and to be discharged to the outside through the above, the speaker cover 244 and the upper casing The 242 system has the following structure.

1. The inner surface of the speaker cover 244 (the surface opposite to the surface of the vibrating plate and the upper casing 242) is a surface that is mostly flat.

2. The height position of the space S and the height position of the sound reproduction port 247 are To be roughly the same.

3. The space S is stopped at a position along the half circumference on the side opposite to the sound emitting port 247 side of the speaker driving element 241. That is, the space S described above is viewed from the vibration direction of the vibrating plate by the space portion S1 corresponding to the vibrating plate outer shape and from the space portion S1 to the sound emitting port 247 of the speaker cover 244. The space part is composed of S2.

In order to make the space S a dense structure other than the sound emission port 247, the portion where the surface of the upper casing 242 and the inner surface of the speaker cover 244 are joined to each other is pressed against each other by the buffer sheet 250. Further, the cushion sheet 250 is configured to suppress the vibration of the upper casing 242 from being transmitted to the speaker cover 244 in response to the vibration plate.

Further, the side surface of the speaker cover 244 on which the sound emitting port 247 is provided refers to the surface facing the front side when the user wears the earphone type acoustic device 100. In other words, the sound emitting port 247 is provided at one end of the space S which is orthogonal to the sliding direction of the sliders 20R and 20L. The reason is as follows.

The wearing type of the earphone type acoustic device 100 of the present embodiment is mainly considered to have two types. One of them is a wearable type when the earphone is used as shown in FIG. That is, the left and right outer casing blocks 40R, 40L are worn against the left and right ears of the user. This is called "head wear type".

The other type is a wearable type in which the headband 10 and the left and right sliders 20R and 20L are hung on the neck of the user, as shown in FIG. This is called "neck wear type". When the neck wears the pattern, the left and right The sound emitting ports 247 of the sounder elements 24, 24 are located substantially directly below the left and right ears of the user. At this time, the sound reproduction port 247 is oriented directly upward. Thereby, the sound from the left and right speaker elements 24, 24 can efficiently reach the left and right ears of the user.

Further, as shown in FIG. 3, the lower casing 243 of the speaker element 24 is fixedly supported by the slide base 21 by screws or the like via the cushion member 28. Thereby, it is possible to suppress the vibration of the speaker element 24 from being transmitted to the slide base 21 of the sliders 20R, 20L.

[Circuit Configuration of Headphone Type Audio Device 100]

Fig. 8 is a view showing a circuit configuration of the earphone type acoustic device 100 of the present embodiment.

As shown in the figure, the headphone type acoustic device 100 includes a processor 110, a memory 112, a user operation unit 114, a cache memory 116, a headphone amplifier 118, a speaker amplifier 119, earphone elements 44 and 44, and a speaker. Elements 24 and 24, external input terminal 120, switching circuit 122, battery 124, and the like.

The processor 110 (processor) is a control circuit for performing control, necessary arithmetic processing, and signal processing of the entire earphone type acoustic device 100 of the present embodiment, and is configured, for example, by a BGA (Ball Grid Array) or the like.

The memory 112 stores programs and the like executed by the processor 110, and is used as a work area of the processor 110 or the like. The memory 112 is, for example, SDRAM (Synchronous Dynamic Random) Access Memory).

The user operation unit 114 is, for example, a knob switch, a slide switch, a push button switch, or the like, and is a device that accepts an input caused by a user's operation.

The switch of the user operation unit 114 includes an ON/OFF switch of a main power source, a volume level switch, an output change switch, and the like. The output switch is used to select a switch that switches the headphone output and the speaker output.

The processor 110 detects the state of the output switch, and determines from the result that the user selects one of the headphone output or the speaker output. The processor 110, when determining that the user selects the headphone output, causes the headphone amplifier 118 to be in an active state, thereby driving the earphone elements 44, 44. Further, when determining that the user selects the speaker output, the processor 110 causes the speaker amplifier 119 to be in an active state, thereby driving the speaker elements 24 and 24.

The cache memory 116 stores, for example, an audio file as a user data, and is a non-volatile memory device that can be rewritten or deleted.

The headphone amplifier 118 (first amplifier) amplifies the audio signals output by the processor 110 and supplies them to the headphone elements 44, 44.

The speaker amplifier 119 (second amplifier) amplifies the audio signal output by the processor 110 and supplies it to the speaker elements 24, 24.

The external input terminal 120 is a connection portion with an external device such as a smart phone or a portable audio device.

The switching circuit 122 is external to the external input terminal 120 Based on the connection state of the machine, the input source of the earphone elements 44, 44 is switched between the headphone amplifier 118 and an external machine. That is, when the external input terminal 120 is not connected to the external device, the input source of the earphone elements 44, 44 is set to the headphone amplifier 118, and when the external input terminal 120 is connected to the external machine, the input sources of the earphone elements 44, 44 are switched. For external machines.

The battery 124 stores and supplies a power source for operating the earphone type acoustic device 100. The battery 124 is a rechargeable person such as a lithium battery.

In addition, the earphone type acoustic device 100 has a display such as an LED (Light Emitting Diode) for displaying various kinds of information, and a general-purpose interface such as a USB (Universal Serial Bus).

[Operation of Headphone Type Audio Device 100]

When the user selects the headphone output by the operation of the user operation unit 114 (output switching switch), the processor 110 determines the selection content and causes the headphone amplifier 118 to be in an active state.

When the user instructs the broadcast of the music by the user operation unit 114, the processor 110 reads, decodes, demodulates, and converts the analog signal of the music from the cache memory 116, for example. The analog audio signal is supplied to the headphone amplifier 118. The audio signal amplified by the headphone amplifier 118 is supplied to the earphone elements 44, 44 to drive the headphone elements 44, 44. Thereby, the user can Enjoy the music output from the headphones in the head wear mode.

When the user selects the speaker output by the operation of the user operation unit 114 (output switching switch), the processor 110 determines the selection content and causes the speaker amplifier 119 to be in the active state. The processor 110 supplies the audio signal generated by the audio file to the speaker amplifier 119. The audio signal amplified by the speaker amplifier 119 is supplied to the speaker elements 24, 24 to drive the speaker elements 24, 24. Thereby, the user can enjoy the music output by the speaker in the neck wear type.

Moreover, when listening to the music output by the earphone, if the user switches to the speaker output by operating the user operation portion 114, the processor 110 switches the headphone amplifier 118 to an inactive state, and switches the speaker amplifier 119 to Active state. That is, the headphone type audio device 100 can switch the music outputted by the earphone to the music output by the speaker at any time by the operation of the user operation portion 114 by the user. The same is true for the case where the speaker output is switched to the headphone output.

As described above, the earphone type acoustic device 100 of the present embodiment is provided with the speaker elements 24 and 24 in the left and right sliders 20R and 20L in addition to the earphone elements 44 and 44 provided in the left and right outer casing blocks 40R and 40L, respectively. When the speaker elements 24 and 24 are used to enjoy music, as shown in FIG. 7, the user is recommended to hang on the neck by a product manual or the like. When the neck is in the state of the neck, the sound-emitting ports 247 of the left and right speaker elements 24, 24 are located substantially directly below the left and right ears of the user, and are substantially upward. That is, from the left and right speaker elements 24, 24 The sound will be emitted from below towards the user's ear. Therefore, even if the volume of the speaker elements 24, 24 is not greatly increased, the user can fully feel the volume of the sound.

Further, the overall length including the headband 10 and the sliders 20R and 20L can be appropriately changed manually by the user. Therefore, for example, as shown in FIG. 9, the locking position is changed to a position where the headband 10 is slightly pulled out from the sliders 20R and 20L, or conversely, the locking position is changed to a slightly pushed position. The positional relationship between the left and right ears of the user and the left and right speakers 24, 24 is freely adjusted.

Moreover, when the speaker is used, since it does not become a state of plugging the ear as in the case of using the earphone, the surrounding sound enters the user's ear simultaneously with the music. Therefore, the safety of the user on the move can be improved.

[Effects of Patent Document 1]

1. When the speaker is in use, the user can listen to the sound from the left and right speaker elements 24, 24 with the left and right ears in a state where the earphone type acoustic device 100 is hung on the neck. Therefore, a better stereo effect can be obtained by listening to the sound from the left and right outer casing blocks at a separate position as described in Patent Document 1.

2. The earphone type acoustic device 100 of the present embodiment transmits sound through the space between the speaker element 24 and the ear, so that the output power of the speaker element to be placed in the casing is used for the low power of the earphone and the speaker. Compared to the way of switching between high power, you can enjoy more natural Speaker sound.

Further, the present technology can be configured as described below.

(1) A headphone type acoustic device comprising: a headband; and a pair of sliders each having one end portion slidably attached to both end portions of the headband; and a pair of outer casing blocks connected to each other through the connection portion The other end portions of the pair of slide blocks each include an earphone element, and speaker elements are respectively disposed on the pair of slide blocks.

(2) The earphone type acoustic device according to (1), further comprising: a first amplifier that amplifies an audio signal supplied to the earphone element; and a second amplifier that is supplyable to the speaker element The audio signal is amplified; and the operation unit receives the switching instruction from the user; and the control unit switches the first amplifier and the second amplifier in accordance with the instruction received by the operation unit.

(3) The earphone type acoustic device according to the above aspect (1), wherein the speaker element includes a speaker driving element and a cover, and the speaker driving element includes a vibration that can vibrate in a thickness direction of the sliding block. a plate, a magnetic circuit for driving the vibrating plate, and a state in which the vibrating plate is exposed, and the vibrating plate and the magnetic circuit are held and housed a housing that forms a space between the surface on which the vibrating plate is exposed and the housing, and has a direction for orthogonally forming a sound from the sliding direction of the sliding block in the space The opening that is released at one end.

Claims (4)

An earphone type acoustic device comprising: a headband; and a pair of sliding blocks each having one end portion slidably attached to both end portions of the headband; and a pair of outer casing blocks connected to the one through the connecting portion Each of the other ends of the sliders is provided with an earphone element; and the speaker elements are respectively disposed on the pair of sliders; and the headband and the pair of sliders are attached to the neck of the user. In the state, the speaker element is closer to the ear of the user than the earphone element. The earphone type acoustic device according to claim 1, further comprising: a first amplifier capable of amplifying an audio signal supplied to the earphone element; and a second amplifier capable of amplifying an audio signal supplied to the speaker element And an operation unit that receives a switching instruction from the user; and a control unit that switches the first amplifier and the second amplifier in accordance with the instruction received by the operation unit. The headphone type acoustic device according to claim 2, wherein the speaker element includes a speaker driving element and a cover, and the speaker driving element includes a vibrating plate that can vibrate in a thickness direction of the sliding block, and a diaphragm that drives the vibrating plate Magnetic circuit, and the aforementioned vibration a housing in which the vibrating plate and the magnetic circuit are held and housed in a state in which the movable plate is exposed; the cover forms a space between the surface on which the vibrating plate is exposed and the outer casing, and has a function for: An opening that is discharged at one end of the space in which the sliding direction of the sliding block forms a direction orthogonal to the sliding direction. The earphone type acoustic device according to claim 3, wherein one of the sides of the space in which the sliding direction of the sliding block is orthogonal to each other is a front side in a state in which the user wears the earphone type acoustic device. .